200-301 Question 387
Single answerA network administrator notices that during peak traffic periods, critical VoIP packets are experiencing delays on a congested link. To address this issue, the administrator configures the router to prioritize VoIP traffic over other traffic types. Which of the following techniques is the MOST appropriate to ensure VoIP traffic gets priority while managing congestion?
- A
Weighted Fair Queuing (WFQ)
- B
Traffic Policing
- C
Priority Queuing (PQ)
- D
Traffic Shaping
Show answer and explanation
Correct answer: C
Explanation
Priority Queuing (PQ) is the most appropriate technique for addressing congestion while ensuring VoIP packets are prioritized. PQ allows high-priority traffic to be processed first, minimizing delay and jitter for real-time traffic like VoIP. While other methods like WFQ, policing, or shaping play important roles in traffic management, they do not specifically address the problem of prioritizing real-time traffic during congestion.
- A. Incorrect.
Weighted Fair Queuing (WFQ) allocates bandwidth fairly among traffic flows but does not provide strict priority for specific traffic such as VoIP. This makes it less suitable for real-time traffic that requires minimal delay.
- B. Incorrect.
Traffic Policing enforces bandwidth limits by dropping or remarking excess traffic, but it does not prioritize specific traffic. This could lead to VoIP packets being dropped during congestion.
- C. Correct.
Priority Queuing (PQ) ensures that high-priority traffic, such as VoIP, is transmitted before other traffic. This is the most suitable technique for minimizing delays for critical real-time traffic.
- D. Incorrect.
Traffic Shaping smoothens traffic flow by buffering and delaying packets to conform to a defined rate, but it does not prioritize traffic. It is not ideal for scenarios where real-time traffic needs to be prioritized.